Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety.


really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
0 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Mitsubishi Diamante transmission problems

transmission problem

Find something helpful? Spread the word.
Get notified about new defects, investigations, recalls & lawsuits for the 2004 Mitsubishi Diamante:

Unsubscribe any time. We don't sell/share your email.

2004 Mitsubishi Diamante Owner Comments

problem #1

Oct 282011


  • Automatic transmission
  • miles


Cpsc#I11B0131A. 2004 Mitsubishi Diamante. F4A51 automatic transmission failure. The consumer stated she has concerns with the safety and reliability of Mitsubishi and Dodge vehicles and their owners that have the Mitsubishi F4A51 automatic transmission in certain make/models. The main issues seemed to be a manufacturing defect in the wave/cushion spring located in the transmission designed the wave spring as a fragile two coil piece which has been known to repeatedly break causing catastrophic failure in the transmission. When the wave breaks, actual pieces of the wave spring make it through Mitsubishi's also faulty transmission filter and lodge themselves in the pump gear, causing the hear to actually break. After the pump gear has been broken inside the transmission, all forward and reverse gears immediately stop functioning and in most instances the vehicle shuts off. The consumer stated she had the F4A51 automatic transmission in her vehicle, which had to be replaced.

- Henrico, VA, USA

Not what you are looking for?